Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-03-04
Astronomy and Astrophysics
Astrophysics
14 pages LaTeX + 1 EPS figure + 2 EPS colour figures, epsf.sty and aasms4.sty included; to be published in Science & Supercomp
Scientific paper
We have preliminary results on the parallelization of a Tree-Code for evaluating gravitational forces in N-body astrophysical systems. For our Cray T3D/CRAFT implementation, we have obtained an encouraging speed-up behavior, which reaches a value of 37 with 64 processor elements (PEs). According to the Amdahl'law, this means that about 99% of the code is actually parallelized. The speed-up tests regarded the evaluation of the forces among N = 130,369 particles distributed scaling the actual distribution of a sample of galaxies seen in the Northern sky hemisphere. Parallelization of the time integration of the trajectories, which has not yet been taken into account, is both easier to implement and not as fundamental.
Capuzzo-Dolcetta Roberto
Miocchi Paolo
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